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y = (x - 2)^2

I understand it to be a quadratic, and if I used the formula to work it out I would see two roots,

x = - 2 or x = 2

If I put the above equation into a graphics calculator the result is always x = 2

Looking at the equation above I could just say x^2 and 2^2 = x^2 + 4

What I don't understand is by looking at the equation how x = 2 when it is graphed?

I know its right but don't understand?